Область JavaScript, когда все стороны известны
// JavaScript program to find the area of a triangle
const side1 = parseInt(prompt('Enter side1: '));
const side2 = parseInt(prompt('Enter side2: '));
const side3 = parseInt(prompt('Enter side3: '));
// calculate the semi-perimeter
const s = (side1 + side2 + side3) / 2;
//calculate the area
const areaValue = Math.sqrt(
s * (s - side1) * (s - side2) * (s - side3)
);
console.log(
`The area of the triangle is ${areaValue}`
);
SAMER SAEID